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/*
* Softmmu related functions
*
* Copyright (C) 2010-2012 Guan Xuetao
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation, or any later version.
* See the COPYING file in the top-level directory.
*/
#ifdef CONFIG_USER_ONLY
#error This file only exist under softmmu circumstance
#endif
#include <cpu.h>
#undef DEBUG_UC32
#ifdef DEBUG_UC32
#define DPRINTF(fmt, ...) printf("%s: " fmt , __func__, ## __VA_ARGS__)
#else
#define DPRINTF(fmt, ...) do {} while (0)
#endif
#define SUPERPAGE_SIZE (1 << 22)
#define UC32_PAGETABLE_READ (1 << 8)
#define UC32_PAGETABLE_WRITE (1 << 7)
#define UC32_PAGETABLE_EXEC (1 << 6)
#define UC32_PAGETABLE_EXIST (1 << 2)
#define PAGETABLE_TYPE(x) ((x) & 3)
/* Map CPU modes onto saved register banks. */
static inline int bank_number(int mode)
{
switch (mode) {
case ASR_MODE_USER:
case ASR_MODE_SUSR:
return 0;
case ASR_MODE_PRIV:
return 1;
case ASR_MODE_TRAP:
return 2;
case ASR_MODE_EXTN:
return 3;
case ASR_MODE_INTR:
return 4;
}
cpu_abort(cpu_single_env, "Bad mode %x\n", mode);
return -1;
}
void switch_mode(CPUUniCore32State *env, int mode)
{
int old_mode;
int i;
old_mode = env->uncached_asr & ASR_M;
if (mode == old_mode) {
return;
}
i = bank_number(old_mode);
env->banked_r29[i] = env->regs[29];
env->banked_r30[i] = env->regs[30];
env->banked_bsr[i] = env->bsr;
i = bank_number(mode);
env->regs[29] = env->banked_r29[i];
env->regs[30] = env->banked_r30[i];
env->bsr = env->banked_bsr[i];
}
/* Handle a CPU exception. */
void do_interrupt(CPUUniCore32State *env)
{
uint32_t addr;
int new_mode;
switch (env->exception_index) {
case UC32_EXCP_PRIV:
new_mode = ASR_MODE_PRIV;
addr = 0x08;
break;
case UC32_EXCP_ITRAP:
DPRINTF("itrap happened at %x\n", env->regs[31]);
new_mode = ASR_MODE_TRAP;
addr = 0x0c;
break;
case UC32_EXCP_DTRAP:
DPRINTF("dtrap happened at %x\n", env->regs[31]);
new_mode = ASR_MODE_TRAP;
addr = 0x10;
break;
case UC32_EXCP_INTR:
new_mode = ASR_MODE_INTR;
addr = 0x18;
break;
default:
cpu_abort(env, "Unhandled exception 0x%x\n", env->exception_index);
return;
}
/* High vectors. */
if (env->cp0.c1_sys & (1 << 13)) {
addr += 0xffff0000;
}
switch_mode(env, new_mode);
env->bsr = cpu_asr_read(env);
env->uncached_asr = (env->uncached_asr & ~ASR_M) | new_mode;
env->uncached_asr |= ASR_I;
/* The PC already points to the proper instruction. */
env->regs[30] = env->regs[31];
env->regs[31] = addr;
env->interrupt_request |= CPU_INTERRUPT_EXITTB;
}
static int get_phys_addr_ucv2(CPUUniCore32State *env, uint32_t address,
int access_type, int is_user, uint32_t *phys_ptr, int *prot,
target_ulong *page_size)
{
int code;
uint32_t table;
uint32_t desc;
uint32_t phys_addr;
/* Pagetable walk. */
/* Lookup l1 descriptor. */
table = env->cp0.c2_base & 0xfffff000;
table |= (address >> 20) & 0xffc;
desc = ldl_phys(table);
code = 0;
switch (PAGETABLE_TYPE(desc)) {
case 3:
/* Superpage */
if (!(desc & UC32_PAGETABLE_EXIST)) {
code = 0x0b; /* superpage miss */
goto do_fault;
}
phys_addr = (desc & 0xffc00000) | (address & 0x003fffff);
*page_size = SUPERPAGE_SIZE;
break;
case 0:
/* Lookup l2 entry. */
if (is_user) {
DPRINTF("PGD address %x, desc %x\n", table, desc);
}
if (!(desc & UC32_PAGETABLE_EXIST)) {
code = 0x05; /* second pagetable miss */
goto do_fault;
}
table = (desc & 0xfffff000) | ((address >> 10) & 0xffc);
desc = ldl_phys(table);
/* 4k page. */
if (is_user) {
DPRINTF("PTE address %x, desc %x\n", table, desc);
}
if (!(desc & UC32_PAGETABLE_EXIST)) {
code = 0x08; /* page miss */
goto do_fault;
}
switch (PAGETABLE_TYPE(desc)) {
case 0:
phys_addr = (desc & 0xfffff000) | (address & 0xfff);
*page_size = TARGET_PAGE_SIZE;
break;
default:
cpu_abort(env, "wrong page type!");
}
break;
default:
cpu_abort(env, "wrong page type!");
}
*phys_ptr = phys_addr;
*prot = 0;
/* Check access permissions. */
if (desc & UC32_PAGETABLE_READ) {
*prot |= PAGE_READ;
} else {
if (is_user && (access_type == 0)) {
code = 0x11; /* access unreadable area */
goto do_fault;
}
}
if (desc & UC32_PAGETABLE_WRITE) {
*prot |= PAGE_WRITE;
} else {
if (is_user && (access_type == 1)) {
code = 0x12; /* access unwritable area */
goto do_fault;
}
}
if (desc & UC32_PAGETABLE_EXEC) {
*prot |= PAGE_EXEC;
} else {
if (is_user && (access_type == 2)) {
code = 0x13; /* access unexecutable area */
goto do_fault;
}
}
do_fault:
return code;
}
int uc32_cpu_handle_mmu_fault(CPUUniCore32State *env, target_ulong address,
int access_type, int mmu_idx)
{
uint32_t phys_addr;
target_ulong page_size;
int prot;
int ret, is_user;
ret = 1;
is_user = mmu_idx == MMU_USER_IDX;
if ((env->cp0.c1_sys & 1) == 0) {
/* MMU disabled. */
phys_addr = address;
prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
page_size = TARGET_PAGE_SIZE;
ret = 0;
} else {
if ((address & (1 << 31)) || (is_user)) {
ret = get_phys_addr_ucv2(env, address, access_type, is_user,
&phys_addr, &prot, &page_size);
if (is_user) {
DPRINTF("user space access: ret %x, address %x, "
"access_type %x, phys_addr %x, prot %x\n",
ret, address, access_type, phys_addr, prot);
}
} else {
/*IO memory */
phys_addr = address | (1 << 31);
prot = PAGE_READ | PAGE_WRITE | PAGE_EXEC;
page_size = TARGET_PAGE_SIZE;
ret = 0;
}
}
if (ret == 0) {
/* Map a single page. */
phys_addr &= TARGET_PAGE_MASK;
address &= TARGET_PAGE_MASK;
tlb_set_page(env, address, phys_addr, prot, mmu_idx, page_size);
return 0;
}
env->cp0.c3_faultstatus = ret;
env->cp0.c4_faultaddr = address;
if (access_type == 2) {
env->exception_index = UC32_EXCP_ITRAP;
} else {
env->exception_index = UC32_EXCP_DTRAP;
}
return ret;
}
target_phys_addr_t cpu_get_phys_page_debug(CPUUniCore32State *env,
target_ulong addr)
{
cpu_abort(env, "%s not supported yet\n", __func__);
return addr;
}
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